import * as types from './mutation-types'
import { playMode } from 'common/js/config'
import { shuffle } from 'common/js/util'
import {
  saveSearch,
  deleteSearch,
  clearSearch,
  savePlay,
  saveFavorite,
  deleteFavorite
} from 'common/js/cache'

function findIndexFunc (list, song) {
  return list.findIndex(item => {
    return item.id === song.id
  })
}
export const selectPlay = function ({ commit, state }, { list, index }) {
  commit(types.SET_SEQUENCE_LIST, list)
  if (state.mode === playMode.random) {
    let randomList = shuffle(list)
    commit(types.SET_PLAYLIST, randomList)
    index = findIndexFunc(randomList, list[index]) // 随机播放全部后再点击歌曲依旧是随机模式
  } else {
    commit(types.SET_PLAYLIST, list)
  }
  commit(types.SET_CURRENT_INDEX, index)
  commit(types.SET_FULL_SCREEN, true)
  commit(types.SET_PLAYING_STATE, true)
}
export const randomPlay = function ({ commit }, { list }) {
  commit(types.SET_PLAY_MODE, playMode.random)
  commit(types.SET_SEQUENCE_LIST, list)
  let randomList = shuffle(list)
  commit(types.SET_PLAYLIST, randomList)
  commit(types.SET_CURRENT_INDEX, 0)
  commit(types.SET_FULL_SCREEN, true)
  commit(types.SET_PLAYING_STATE, true)
}

export const insertSong = function ({ commit, state }, song) {
  let playlist = state.playList.slice()
  let sequenceList = state.sequenceList.slice() // slice()创建副本
  let currentIndex = state.currentIndex
  // 记录当前歌曲
  let currentSong = playlist[currentIndex]
  // 查找当前列表中是否存在待插入的歌曲并返回其索引
  let fpIndex = findIndexFunc(playlist, song)
  // 插入歌曲，索引+1
  currentIndex++
  // 插入这首歌到当前索引位置
  playlist.splice(currentIndex, 0, song)
  // 如果已经包含这首歌
  if (fpIndex > -1) {
    // 当前插入的序号大于列表中的序号
    if (currentIndex > fpIndex) {
      playlist.splice(fpIndex, 1)
      currentIndex--
    } else {
      playlist.splice(fpIndex + 1, 1)
    }
  }
  let currentSIndex = findIndexFunc(sequenceList, currentSong) + 1
  let fsIndex = findIndexFunc(sequenceList, song)
  sequenceList.splice(currentSIndex, 0, song)
  if (fsIndex > -1) {
    if (currentSIndex > fsIndex) {
      sequenceList.splice(fsIndex, 1)
    } else {
      sequenceList.splice(fsIndex + 1, 1)
    }
  }
  commit(types.SET_PLAYLIST, playlist)
  commit(types.SET_SEQUENCE_LIST, sequenceList)
  commit(types.SET_CURRENT_INDEX, currentIndex)
  commit(types.SET_FULL_SCREEN, true)
  commit(types.SET_PLAYING_STATE, true)
}

export const saveSearchHistory = function ({ commit }, query) {
  commit(types.SET_SEARCH_HISTORY, saveSearch(query))
}

export const deleteSearchHistory = function ({ commit }, query) {
  commit(types.SET_SEARCH_HISTORY, deleteSearch(query))
}

export const clearSearchHistory = function ({ commit }) {
  commit(types.SET_SEARCH_HISTORY, clearSearch())
}

export const deleteSong = function ({ commit, state }, song) {
  let playlist = state.playList.slice()
  let sequenceList = state.sequenceList.slice() // slice()创建副本
  let currentIndex = state.currentIndex
  let pIndex = findIndexFunc(playlist, song)
  playlist.splice(pIndex, 1)
  let sIndex = findIndexFunc(sequenceList, song)
  sequenceList.splice(sIndex, 1)
  if (currentIndex > pIndex || currentIndex === playlist.length) {
    currentIndex--
  }
  commit(types.SET_PLAYLIST, playlist)
  commit(types.SET_SEQUENCE_LIST, sequenceList)
  commit(types.SET_CURRENT_INDEX, currentIndex)

  const playingState = playlist.length > 0
  commit(types.SET_PLAYING_STATE, playingState)
}

export const deleteSongList = function ({ commit }) {
  commit(types.SET_PLAYLIST, [])
  commit(types.SET_SEQUENCE_LIST, [])
  commit(types.SET_CURRENT_INDEX, -1)
  commit(types.SET_PLAYING_STATE, false)
}

export const savePlayHistory = function ({ commit }, song) {
  commit(types.SET_PLAY_HISTORY, savePlay(song))
}

export const saveFavoriteList = function ({ commit }, song) {
  commit(types.SET_FAVORITE_LIST, saveFavorite(song))
}

export const deleteFavoriteList = function ({ commit }, song) {
  commit(types.SET_FAVORITE_LIST, deleteFavorite(song))
}
